$ git clone -n https://src.fedoraproject.org/rpms/git-cola.git /var/lib/mock/f39-build-1532389-36224/root/chroot_tmpdir/scmroot/git-cola
Cloning into '/var/lib/mock/f39-build-1532389-36224/root/chroot_tmpdir/scmroot/git-cola'...
$ git fetch origin 1d59f15d8f7435932e389e99f8d4061137968d86:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/git-cola
 * [new ref]         1d59f15d8f7435932e389e99f8d4061137968d86 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1d59f15 Update to 4.3.2